Injection device

Abstract

The invention relates to an injection device. Comprises: an injection plunger for performing an injection movement during an injection; the shell can push the pricking needle of the orientation ring to move during injection; the orientation ring is used for executing needle inserting movement under the pushing of the shell; the unlocking sleeve is provided with an unlocking structure for guiding the injection push rod to rotate around a first direction during injection; a first bulge is arranged on the periphery of the injection push rod; the orientation ring is further used for driving the injection push rod to move relative to the unlocking sleeve and making the first protrusion of the injection push rod enter the guide groove to execute injection movement. The elastic part is used for pushing the injection push rod to do injection motion through elastic force after the first bulge enters the guide groove; the elastic part support is used for limiting the position of the elastic part; the side wall of the unlocking sleeve is provided with a second protrusion, and the elastic piece support is provided with a third protrusion matched with the second protrusion. The contact between the second protrusion and the third protrusion is line contact.

Description

Technical Field

[0001] This application relates to the field of medical devices, and particularly to an injection device. Background Art

[0002] An auto-injector pen is a syringe product that is convenient for patients or the general public to operate. When manufacturers produce it, they first fill the liquid medicine into the syringe to form a prefilled syringe (PFS, also known as a drug-loaded syringe), and then install the PFS into the auto-injection device to form an auto-injector pen for transportation and sales. After obtaining the auto-injector pen, consumers use it as needed, remove the pen cap, and then press it against the injection site of the patient for trigger injection to complete the automatic injection of the liquid medicine. Compared with traditional syringes, the processes of sucking medicine, inserting the needle, and pushing the medicine with a disposable syringe are omitted, the operation is more convenient, and the injection dose can be guaranteed, and there will be no deviation in the injection dose due to unskilled operation.

[0003] However, in the existing auto-injector pens, there are situations where the trigger resistance is too large and it is prone to jamming during the triggering process. Summary of the Invention

[0004] In view of this, to solve at least one problem in the background art, this application provides an injection device.

[0005] To achieve the above object, the technical solution of this application is realized as follows:

[0006] An embodiment of this application provides an injection device, including:

[0007] An injection push rod for performing an injection movement along a first direction during injection to push out the injection liquid;

[0008] A housing including a proximal end and a distal end opposite thereto;

[0009] An orientation ring located inside the housing for performing a needle insertion movement under the push of the housing;

[0010] An unlocking sleeve sleeved on the orientation ring and provided with an unlocking structure for guiding the injection push rod to rotate a first preset angle around the first direction during injection, and the unlocking structure is an inclined surface or a curved surface; a first protrusion that cooperates with the unlocking structure and penetrates the outer wall of the orientation ring is provided on the outer periphery of the injection push rod;

[0011] An elastic part for pushing the injection movement of the injection push rod through elastic force;

[0012] An elastic part bracket for limiting the position of the elastic part; the elastic part bracket is linked with the orientation ring in the first direction;

[0013] The side wall of the unlocking sleeve is provided with a first elastic arm, the first elastic arm is provided with a second protrusion, and the elastic member bracket is provided with a third protrusion; before work, the movement of the elastic member bracket is restricted by the abutment of the second protrusion and the third protrusion in the first direction; at least one of the second protrusion or the third protrusion is provided with an inclined surface or an arc surface at the mutually abutting part, so that the contact between the two is a line contact; during work, the elastic member bracket presses the unlocking sleeve, and the first elastic arm is pushed to open outwards by the component force generated by the inclined surface or the arc surface, so that the second protrusion and the third protrusion are separated from contact, and the movement restriction of the elastic member bracket is released.

[0014] Optionally, the second protrusion is provided with a first inclined surface at the part contacting the third protrusion, the third protrusion is provided with a second inclined surface at the part contacting the second protrusion, and the inclination angles of the first inclined surface and the second inclined surface are different.

[0015] Optionally, the second protrusion is provided with a first plane connected to the proximal end of the first inclined surface; the third protrusion is provided with a second plane connected to the distal end of the second inclined surface, and the first plane and the second plane are both parallel to the first direction when they are in contact with each other.

[0016] Optionally, the width of the first elastic arm at the narrowest part in the circumferential direction is set to 2 mm - 4 mm, and the thickness of the first elastic arm in the radial direction is 0.7 mm - 1.1 mm.

[0017] Optionally, the side wall of the orientation ring is provided with a first card slot, and the first elastic arm is further provided with a fourth protrusion; after the injection is completed, after the elastic member bracket contracts inwards, the fourth protrusion abuts against the first card slot of the orientation ring in the first direction to prevent the needle-pricking movement of the orientation ring.

[0018] Optionally, the surface of the fourth protrusion in contact with the first card slot is inclined to form a barb structure.

[0019] Optionally, the inclination angle of the surface of the fourth protrusion in contact with the first card slot is 10° - 30°.

[0020] Optionally, the outer side of the elastic member bracket is provided with a first tongue extending into the first card slot, and through the cooperation of the first card slot and the first tongue, and the elastic force of the elastic member, a linkage in the first direction is established between the elastic member bracket and the orientation ring.

[0021] Optionally, a blind hole for accommodating the elastic member is provided in the injection push rod, and the opening of the blind hole is located at the distal end of the injection push rod; one end of the elastic part abuts against the bottom wall of the blind hole, and the other end passes through the opening of the blind hole and abuts against the distal end of the elastic member bracket, so that the injection push rod axially moves following the axial movement of the elastic member bracket.

[0022] Optionally, the elastic member bracket includes a top cover and second elastic arms connected to both sides of the top cover and extending in a first direction, and the first tongue is provided on the second elastic arm; the other end of the elastic part abuts against the top cover.

[0023] The injection device provided by the embodiment of the present application includes: an injection push rod for performing an injection movement during injection to push out the injection liquid by pushing the piston in the liquid medicine bottle to move; the injection movement is a linear movement along the first direction; a housing including a proximal end and a distal end opposite thereto; the housing can push the puncturing movement of the orientation ring during injection, and the puncturing movement is a movement of pushing the injection needle of the liquid medicine bottle into the target organism; the orientation ring is located inside the housing and is used to perform the puncturing movement under the push of the housing; the orientation ring is sleeved on the injection push rod and is provided with a guiding groove for guiding the injection push rod to perform the injection movement; an unlocking sleeve is sleeved on the orientation ring and is provided with an unlocking structure for guiding the injection push rod to rotate a first preset angle around the first direction during injection, and the unlocking structure is an inclined surface or an arc surface; a first protrusion that cooperates with the unlocking structure and penetrates through the outer wall of the orientation ring is provided on the outer periphery of the injection push rod; the orientation ring is further used to drive the injection push rod to move relative to the unlocking sleeve and trigger the injection push rod to rotate around the first direction, so that the first protrusion enters the guiding groove; an elastic part for pushing the injection movement of the injection push rod by elastic force after the first protrusion enters the guiding groove; an elastic part bracket for defining the position of the elastic part; during the puncturing movement and the injection movement, the elastic part bracket and the orientation ring are linked in the first direction; a first elastic arm is provided on the side wall of the unlocking sleeve, a second protrusion is provided on the first elastic arm, and a third protrusion that cooperates with the second protrusion is provided on the elastic part bracket; before the injection device works, the movement of the elastic part bracket in the first direction is restricted by the abutment of the second protrusion and the third protrusion in the axial direction; at least one of the second protrusion or the third protrusion is provided with an inclined surface or an arc surface at the mutually abutting part, so that the contact between the two is a line contact; when the injection device works, a relative movement occurs between the unlocking sleeve and the elastic part bracket in the first direction, and the first elastic arm is pushed by the component force generated by the inclined surface or the arc surface to open outwards, so that the second protrusion and the third protrusion are separated from contact, and the movement restriction of the elastic part bracket in the first direction is released. It can be seen that in the injection device of the embodiment of the present application, an inclined surface or an arc surface that cooperate with each other are provided on the second protrusion of the unlocking sleeve and the third protrusion of the elastic part bracket, so that the contact between the two is a line contact, reducing the sliding resistance of the elastic part bracket relative to the unlocking sleeve movement, making the user's operation relatively labor-saving. Therefore, the injection device of the embodiment of the present application can make the user's operation relatively labor-saving.

[0024] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0025] The drawings described herein are used to provide a further understanding of the present application, constitute a part of the present application, and the schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0026] Figure 1Schematic diagram of the external shape of the injection device provided by the embodiment of the present application;

[0027] Figure 2 Exploded view (exploded diagram) of the injection device provided by the embodiment of the present application;

[0028] Figure 3 Schematic diagram of the orientation ring in the injection device provided by the embodiment of the present application;

[0029] Figure 4 Schematic diagram of the injection push rod in the injection device provided by the embodiment of the present application;

[0030] Figure 5 Schematic diagram of the unlocking sleeve in the injection device provided by the embodiment of the present application Figure 1 ;

[0031] Figure 6 Schematic diagram of the injection push rod, elastic part and elastic part bracket installed together in the injection device provided by the embodiment of the present application;

[0032] Figure 7 is Figure 6 Cross-sectional schematic diagram;

[0033] Figure 8 Cross-sectional schematic diagram of the injection device provided by the embodiment of the present application when not working;

[0034] Figure 9 is Figure 8 Local enlarged schematic diagram at A in

[0035] Figure 10 Cross-sectional schematic diagram of the injection device provided by the embodiment of the present application during operation;

[0036] Figure 11 is Figure 10 Local enlarged schematic diagram at B in

[0037] Figure 12 Schematic diagram of the unlocking sleeve in the injection device provided by the embodiment of the present application Figure 2 ;

[0038] Figure 13 Cross-sectional schematic diagram of the injection device provided by the embodiment of the present application after injection is completed;

[0039] Figure 14 is Figure 13 Local enlarged schematic diagram at C in

[0040] Explanation of reference numerals:

[0041] 10. Injection push rod; 11. First protrusion; 12. Elastic part; 13. Blind hole; 20. Medicine liquid bottle; 21. Bottle body; 22. Piston; 23. Injection needle; 30. Housing; 31. Tube body; 32. Tube cap; 33. Fixed bushing; 40. Orientation ring; 41. Guide groove; 42. First card slot; 50. Unlock sleeve; 52. First elastic arm; 521. Second protrusion; 5211. First inclined plane; 5212. First flat surface; 522. Fourth protrusion; 60. Elastic part bracket; 61. Top cover; 62. Limit post; 63. Third protrusion; 631. Second inclined plane; 632. Second flat surface; 64. Second elastic arm; 70. Needle stopper. Detailed implementation manners

[0042] To make the technical solutions and beneficial effects of this application more obvious and understandable, the following will be described in detail by listing specific embodiments. To make the introduction more concise, for some existing technologies related to the embodiments of this application but having little relation to the innovative points of this application, they may not be introduced in the embodiments of this application. Readers can refer to relevant existing technologies, such as the invention patent with the publication number CN116942962B.

[0043] In this application, the drawings are not necessarily drawn to scale, and local features can be enlarged or reduced to more clearly show the details of local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0044] In the description of this application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of the simplified description of this application, rather than indicating that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, that is, it cannot be understood as a limitation to this application.

[0045] In this application, the terms "first" and "second" are only used for the purpose of clear description and cannot be understood as the relative importance of the indicated features or the number of the indicated technical features. Therefore, the features defined with "first" and "second" can clearly include at least one such feature. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc.; the meaning of "several" is at least one, such as one, two, three, etc.; unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly defined, terms such as "installation", "connection", "attachment", "fixation", "setting", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and can also be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In this application, unless otherwise clearly defined, the first feature being "on", "above", "over", "upon", "under", "beneath", "below", or "underneath" the second feature can be that the first feature and the second feature are in direct contact, or the first feature and the second feature are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over", or "upon" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. The first feature being "under", "beneath", or "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0048] To fully understand this application, detailed steps and structures of preferred embodiments will be presented in the following description to illustrate the technical solutions of this application. However, in addition to the preferred embodiments, this application can also have other implementation manners.

[0049] The applicant of this application found in the research and development that in the injection devices in the prior art, the contact area between the protrusions of the elastic arms of the unlocking sleeve and the protrusions of the elastic member bracket is relatively large, for example, it is a surface contact, resulting in a relatively large resistance when the user advances the injection, and it is easy to get stuck.

[0050] Therefore, through further research and development by the applicant, the following technical solutions are proposed.

[0051] To address the technical problems in the related art, an embodiment of this application provides an injection device. Referring to Figure 1 and Figure 2 , the injection device includes:

[0052] An injection push rod 10, configured to perform an injection movement in a first direction during injection to push out the injection liquid from the liquid medicine bottle;

[0053] It can be understood that the injection liquid is installed in the liquid medicine bottle 20, and the liquid medicine bottle 20 can be a medicine bottle containing a fluid medicine. The liquid medicine bottle 20 can include a bottle body 21, a piston 22, and an injection needle 23. The injection push rod 10 is used to push the piston to move.

[0054] Understandably, the movement of the piston 22 refers to its movement within the medicine vial 20. The movement of the piston 22 can squeeze the injection liquid within the medicine vial 20 to flow out towards the outlet end, for example, flow out from the injection needle 23.

[0055] The first direction can be the axial direction of the medicine vial 20. Since the injection push rod 10, the housing 30, etc. are all arranged corresponding to the medicine vial 20, therefore, the first direction can also be the axial direction of components such as the injection push rod 10 and the housing 30.

[0056] The housing 30 includes a proximal end and a relative distal end; the housing 30 can drive the needle insertion movement of the orientation ring 40 during injection, and the needle insertion movement is the movement of pushing the injection needle 23 of the medicine vial 20 into the target organism.

[0057] Understandably, the proximal end is the end close to the target organism during injection, and the distal end is the relative other end. Similarly, other components can also be divided into a proximal end and a distal end according to the direction during injection.

[0058] Specifically, the housing 30 has a first accommodation cavity to accommodate components such as the injection push rod 10, the orientation ring 40, the unlocking sleeve 50, and the elastic part 12.

[0059] Specifically, the needle insertion movement moves along the first direction.

[0060] Specifically, referring to Figure 2 , the housing 30 includes a tube body 31 and a fixed bushing 33 connected to the distal end of the tube body 31; the fixed bushing 33 abuts against the orientation ring 40 in the first direction, and during injection, the fixed bushing 33 drives the movement of the orientation ring 40 in the first direction.

[0061] Manufacturing the housing 30 by separately making the tube body 31 and the fixed bushing 33 and then assembling them is beneficial to reducing the manufacturing cost. For example, the structure is simpler after separation, which can simplify the processing.

[0062] Understandably, the fixed bushing 33 is used to seal the distal end of the tube body 31, and the fixed bushing 33 abuts against the orientation ring 40 in the first direction. During needle insertion and injection, the movement of the housing 30 in the first direction can drive the movement of the orientation ring 40 in the first direction.

[0063] Specifically, the injection device further includes a tube cap 32; the tube cap 32 is sleeved on the proximal end of the housing 30 to seal the proximal end of the housing 30.

[0064] In this way, in addition to the needle guard 70 surrounding the injection needle 23 of the medicine vial 20 circumferentially, the injection needle 23 is also protected by the tube cap 32, making it safer to use.

[0065] The orientation ring 40 is located inside the housing 30 and is used to perform the needle insertion movement under the push of the housing 30;

[0066] The orientation ring 40 is sleeved on the injection push rod 10 and is provided with a guiding groove 41 for guiding the injection push rod 10 to perform the injection movement. Refer to Figure 3 ;

[0067] Specifically, the distal end of the orientation ring 40 axially abuts against the housing 30. During injection, the housing 30 moves towards the target organism in the first direction, driving the orientation ring 40 to move in the first direction.

[0068] Specifically, before the injection push rod 10 enters the injection movement, the movement of the orientation ring 40 in the first direction can drive the injection push rod 10 to move in the first direction, that is, to move relative to the unlocking sleeve 50.

[0069] After the injection push rod 10 enters the injection movement, it can perform the injection movement along the direction of the guiding groove 41. Through the guiding groove 41, the moving direction of the injection push rod 10 can be made more stable. Specifically, the guiding groove 41 extends in the first direction.

[0070] The unlocking sleeve 50 is sleeved on the orientation ring 40 and is provided with an unlocking structure for guiding the injection push rod 10 to rotate a first preset angle around the first direction during injection. The unlocking structure is an inclined surface or a curved surface. Refer to Figure 5 ; A first protrusion 11 that cooperates with the unlocking structure and penetrates the outer wall of the orientation ring 40 is provided on the outer periphery of the injection push rod 10. Refer to Figure 4 ;

[0071] The orientation ring 40 is further used to drive the injection push rod 10 to move relative to the unlocking sleeve 50 and trigger the injection push rod 10 to rotate around the first direction, so that the first protrusion 11 enters the guiding groove 41;

[0072] In detail, the unlocking structure is an inclined surface or a curved surface. When the injection push rod 10 moves relative to the unlocking sleeve 50, the first protrusion 11 abuts against the inclined surface or the curved surface and will move along the extension direction of the inclined surface or the curved surface, causing the injection push rod 10 to rotate a first preset angle around the first direction.

[0073] In this embodiment, the unlocking structure is an inclined surface.

[0074] The elastic part 12 pushes the injection movement of the injection push rod through elastic force; that is, it pushes the injection movement of the injection push rod 10 through elastic force after the first protrusion 11 enters the guiding groove 41;

[0075] Understandably, the injection movement of the injection push rod 10 is formed under the elastic force of the elastic part 12. In this way, in addition to the simpler operation of the user, the injection process is also relatively stable and will not be affected by improper force application of the user during injection.

[0076] Specifically, one end of the elastic part 12 abuts against the injection push rod 10. Before injection, the elastic part 12 is in a compressed state, but it cannot exert elastic force because the axial position of the injection push rod 10 is restricted. After the injection push rod 10 rotates a first preset angle, the first protrusion 11 of the injection push rod 10 enters the guiding groove 41, and the axial position restriction is released. Under the elastic force of the elastic part 12, the injection push rod 10 moves along the direction of the guiding groove 41 to perform the injection movement. Refer to Figure 6 and Figure 7 .

[0077] More specifically, the elastic part 12 can be a compression spring. The compression spring can more precisely control the elastic force through parameters such as wire diameter and pitch, and has a low cost.

[0078] The elastic part bracket 60 is used to limit the position of the elastic part 12; the elastic part bracket 60 is linked with the orientation ring 40 in a first direction; that is, in the needle insertion movement and the injection movement, the elastic part bracket 60 is linked with the orientation ring 40 in the first direction.

[0079] Specifically, the proximal end of the elastic part 12 abuts against the injection push rod 10, and the distal end abuts against the elastic part bracket 60. Before injection, the elastic part 12 is compressed between the injection push rod 10 and the elastic part bracket 60. After the axial position restriction of the injection push rod 10 is released, the elastic force of the elastic part 12 drives the injection push rod 10 to move.

[0080] More specifically, refer to Figure 6 and Figure 7 , the elastic part bracket 60 includes a top cover 61 and a limit post 62 connected to the bottom wall of the top cover 61; the elastic part 12 is sleeved on the limit post 62; the other end of the elastic part 12 abuts against the top cover 61.

[0081] The side wall of the unlocking sleeve 50 is provided with a first elastic arm 52, and a second protrusion 521 is provided on the first elastic arm 52; the elastic part bracket 60 is provided with a third protrusion 63 that cooperates with the second protrusion 521; before work, the axial abutment of the second protrusion 521 and the third protrusion 63 restricts the movement of the elastic part bracket 60 in the first direction; at least one of the second protrusion 521 or the third protrusion 63 is provided with an inclined surface or a curved surface at the mutually abutting part, so that the contact between the two is a line contact. Refer to Figure 8 andFigure 9 ; During operation, the elastic member bracket 60 presses against the unlocking sleeve 50, and the first elastic arm 52 is pushed by the component force generated by the inclined surface or the arc surface to open outward, causing the second protrusion 521 and the third protrusion 63 to disengage from each other, releasing the movement restriction of the elastic member bracket 60. Refer to Figure 10 and Figure 11 .

[0082] The cooperation between the third protrusion 63 and the second protrusion 521 can be that the two are in contact in the first direction, thus restricting the relative movement between the elastic member bracket 60 and the unlocking sleeve 50 in the first direction. In actual injection, the unlocking sleeve 50 is stationary relative to the target organism. Therefore, it can be considered that the cooperation between the third protrusion 63 and the second protrusion 521 restricts the movement of the elastic member bracket 60 in the first direction.

[0083] Specifically, the first elastic arm 52 is a cantilever structure, that is, one end is fixed to the side wall of the unlocking sleeve 50 and the other end is suspended. In this way, the first elastic arm 52 has the elasticity to swing outward or inward with the end fixed to the side wall of the unlocking sleeve 50 as the reference. When the injection device is operating, the elastic member bracket 60 moves along the first direction towards the target organism under the drive of the orientation ring 40. In this way, the third protrusion 63 will press against the second protrusion 521 and push the first elastic arm 52 to swing outward and open.

[0084] It can be understood that during the process of the third protrusion 63 pressing against the second protrusion 521, there is a process of mutual sliding. In the injection devices in the prior art, the contact area between the third protrusion 63 and the second protrusion 521 in the first direction is relatively large, resulting in a relatively large resistance to mutual sliding, making the user's operation laborious and prone to jamming. In the embodiments of the present application, by providing mutually cooperating inclined surfaces or arc surfaces at the contact between the two, the contact between the two is a line contact, greatly reducing the sliding resistance and improving the user's operation experience.

[0085] It can be understood that before the injection device operates, the purpose of restricting the movement of the elastic member bracket 60 in the first direction through the axial contact between the second protrusion 521 and the third protrusion 63 is to prevent the injection needle 23 of the medicine bottle 20 from protruding from the housing 30 and injuring the user when not in use.

[0086] To enable the reader to more clearly understand the injection device of the embodiments of the present application, based on the above preliminary introduction of the structure, the working process and action principle of the injection device of the embodiments of the present application will be briefly introduced below. The working process of the injection device mainly includes two stages: needle insertion and injection, which will be introduced as follows:

[0087] 1) Needle insertion. The user holds the housing 30 and presses the needle stopper 70 against the injection site of the target organism. Then, a force is applied to move the housing 30 towards the target organism. Since the needle stopper 70 is against the target organism and does not move relative to the target organism, while the medicine bottle 20 can move with the movement of the housing 30, the injection needle 23 of the medicine bottle 20 can protrude from the needle stopper 70 and penetrate the target organism. After the injection needle 23 penetrates a certain depth, the needle insertion process is completed.

[0088] 2) Injection. During the needle insertion process, the movement of the housing 30 also drives the co-directional movement of the orientation ring 40 and the injection push rod 10, while the unlocking sleeve 50, like the needle stopper 70, does not move relative to the target organism. Therefore, the injection push rod 10 moves relative to the unlocking sleeve 50. After the needle insertion process is completed, the injection push rod 10 rotates a first preset angle around the first direction under the guidance of the unlocking sleeve 50. So that the first protrusion 11 of the injection push rod 10 enters the guiding groove 41 of the orientation ring 40, and then under the elastic force of the elastic part 12, the injection push rod 10 moves along the direction of the guiding groove 41, pushing the piston 22 in the medicine bottle 20 to move, extruding the injection liquid for injection. When the injection push rod 10 moves to a preset position, for example, the piston 22 abuts against the bottom of the medicine bottle 20 and the injection push rod 10 is blocked and cannot move further, the injection process is completed.

[0089] In the injection device according to the embodiment of the present application, mutually cooperating inclined surfaces or arc surfaces are provided on the second protrusion 521 of the unlocking sleeve 50 and the third protrusion 63 of the elastic part support 60, so that their contact is a line contact, reducing the sliding resistance of the elastic part support 60 moving relative to the unlocking sleeve 50, making the operation of the user more labor-saving. Refer to Figure 8 and Figure 9 . Therefore, the injection device according to the embodiment of the present application can make the operation of the user more labor-saving.

[0090] In other embodiments of the present application, the second protrusion 521 is provided with a first inclined surface 5211 at the part contacting the third protrusion 63, the third protrusion 63 is provided with a second inclined surface 631 at the part contacting the second protrusion 521, and the inclination angles of the first inclined surface 5211 and the second inclined surface 631 are different.

[0091] That is, by the different inclination angles, a line contact is formed at the contact of the third protrusion 63 and the second protrusion 521. Compared with the arc surface, the processing cost of the inclined surface is lower.

[0092] Furthermore, the angle between the first inclined surface 5211 and the first direction can be set to be smaller, so that the movement resistance of the elastic part support 60 relative to the unlocking sleeve 50 can also be reduced. The angle between the first inclined surface 5211 and the first direction refers to Figure 9 , and the angle is marked as A1.

[0093] In some other embodiments of the present application, the second protrusion 521 is provided with a first plane 5212 connected to the proximal end of the first inclined plane 5211; the third protrusion 63 is provided with a second plane 632 connected to the distal end of the second inclined plane 631, and the first plane 5212 and the second plane 632 are parallel to each other and both parallel to the first direction.

[0094] In this way, after the elastic member bracket 60 moves relative to the unlocking sleeve 50 and disengages from each other, the two can be separated more smoothly without being affected by sharp corners or the like and causing jams.

[0095] In some other embodiments of the present application, the width of the first elastic arm 52 at the circumferentially narrowest part is set to 2 mm - 4 mm, such as 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, etc., referring to Figure 12 , and the width at the narrowest part is labeled as W1 in Figure 12 ; the thickness of the first elastic arm 52 in the radial direction is 0.7 mm - 1.1 mm, such as 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, etc., and the thickness in the radial direction is labeled as T1 in Figure 5 .

[0096] In this way, the first elastic arm 52 has sufficient strength and sufficient elasticity, that is, when the third protrusion 63 presses against the second protrusion 521, the first elastic arm 52 swings outwards and opens. It can be understood that this swing is based on elastic deformation.

[0097] In some other embodiments of the present application, the side wall of the orientation ring 40 is provided with a first card slot 42, and the first elastic arm 52 is further provided with a fourth protrusion 522; after the injection is completed and the elastic member bracket 60 contracts inwards, the fourth protrusion 522 abuts against the first card slot 42 of the orientation ring 40 in the first direction to prevent the needle insertion movement of the orientation ring 40, referring to Figure 13 and Figure 14 .

[0098] It should be noted that during injection, the injection push rod 10 moves in the first direction along the guide groove 41. After the injection is completed, the injection push rod 10 moves out of the range surrounded by the elastic member bracket 60, so that the second elastic arm 64 of the elastic member bracket 60 (see the following introduction) loses the intermediate support and contracts inwards. The orientation ring 40 naturally drops, and the first card slot 42 abuts against the fourth protrusion 522 in the first direction to prevent further movement of the orientation ring 40, avoiding the injection needle 23 of the discarded injection pen from protruding from the housing 30 and hurting people after injection.

[0099] In some other embodiments of the present application, the surface of the fourth protrusion 522 in contact with the first card slot 42 is inclined to form a barb structure.

[0100] Through the barb structure, the first card slot 42 and the fourth protrusion 522 can be more firmly in contact in the first direction and are not easily loosened.

[0101] In some other embodiments of the present application, the inclination angle of the surface of the fourth protrusion 522 in contact with the first card slot 42 is 10°-30°.

[0102] In this way, the first card slot 42 and the fourth protrusion 522 are firmly in contact and are not easily loosened, and have relatively high strength.

[0103] In some other embodiments of the present application, a first tongue extending into the first card slot 42 is provided on the outer side of the elastic member bracket 60. Through the cooperation of the first card slot 42 and the first tongue, and the elastic force of the elastic member, a linkage in the first direction is established between the elastic member bracket 60 and the orientation ring 40.

[0104] In this way, during the needle insertion movement, by pressing the distal end of the housing 30, the movement of the orientation ring 40 is pushed, and then the movement of the elastic member bracket 60 is pushed.

[0105] In some other embodiments of the present application, the injection push rod 10 is provided with a blind hole 13 for accommodating the elastic member, and the opening of the blind hole 13 is located at the distal end of the injection push rod 10; one end of the elastic part 12 abuts against the bottom wall of the blind hole 13, and the other end passes through the opening of the blind hole 13 and abuts against the distal end of the elastic member bracket 60, so that the injection push rod 10 axially moves following the axial movement of the elastic member bracket 60.

[0106] That is, the elastic part 12 is in a compressed state by abutting against the bottom wall of the blind hole 13 and the distal end of the elastic member bracket 60 at both ends, and then elastic potential energy is generated by compression.

[0107] Specifically, for the convenience of processing, a small hole can be provided at the bottom of the blind hole, and the aperture of the small hole is smaller than the diameter of the elastic part 12.

[0108] In some other embodiments of the present application, the elastic member bracket 60 includes a top cover 61 and second elastic arms 64 connected to both sides of the top cover 61 and extending in the first direction, and the first tongue is provided on the second elastic arm 64; the other end of the elastic part 12 abuts against the top cover 61.

[0109] In this way, the elastic part bracket 60 can not only resist the elastic part 12 in the first direction, but also establish a linkage relationship in the first direction with the orientation ring 40 through the provided first tongue. One part realizes two functions, and the structure is more compact.

[0110] Specifically, the first tongue can be a part of the third protrusion 63. In this way, there is no need to additionally set the structure of the first tongue, and the structure is more compact.

[0111] Specifically, the second elastic arm 64 surrounds the injection push rod 10 and is laterally supported by the injection push rod 10. Before the injection push rod 10 moves out of the range of the second elastic arm 64 due to injection, the second elastic arm 64 cannot contract inward.

[0112] In some other embodiments of the present application, the injection device further includes a needle baffle 70, and the needle baffle 70 is used to surround the injection needle 23 of the medicine bottle 20 from the circumferential direction and abut against the injection site of the target organism during injection;

[0113] That is, the needle baffle 70 is a support for the user to apply force. After the needle baffle 70 abuts against the injection site of the target organism, the user can apply force to the housing 30 with this as a support. The housing 30 moves towards the target organism, that is, moves relative to the needle baffle 70, driving the injection needle 23 of the medicine bottle 20 to protrude from the needle baffle 70 and penetrate into the target organism. And since the needle baffle 70 does not move, the lateral position of the injection needle 23 is relatively stable, and it can penetrate into the injection site relatively accurately without being skewed or off-target.

[0114] It should be understood that the above embodiments are all exemplary and do not cover all possible implementation manners included in the technical solutions of the present application. Without departing from the scope of the disclosure of the present application, various deformations and changes can also be made on the basis of the above embodiments. Similarly, the various technical features of the above embodiments can also be arbitrarily combined to form other embodiments of the present application that may not be clearly described. Therefore, the above embodiments only represent several implementation manners of the present application and do not limit the protection scope of the patent of the present application.

Claims

1. An injection device, characterized in that: include: An injection push rod, used to perform an injection movement along a first direction during injection to push out the injection liquid; a housing including a proximal end and an opposite distal end; A directional ring, located in the housing, and used for performing acupuncture movement under the push of the housing; An unlocking sleeve is sleeved on the directional ring and is provided with an unlocking structure for guiding the injection push rod to rotate around a first direction by a first preset angle during injection, wherein the unlocking structure is an inclined surface or an arc surface; a first protrusion is provided on the outer periphery of the injection push rod and cooperates with the unlocking structure and passes through the outer wall of the directional ring; An elastic part, used for promoting the injection movement of the injection push rod by elastic force; An elastic member bracket, used for defining the position of the elastic member; the elastic member bracket is linked with the directional ring in a first direction; The side wall of the unlocking sleeve is provided with a first elastic arm, the first elastic arm is provided with a second protrusion, and the elastic member bracket is provided with a third protrusion; before operation, the movement of the elastic member bracket is limited by the abutment of the second protrusion and the third protrusion in the first direction; at least one of the second protrusion or the third protrusion is provided with an inclined surface or an arc surface at the mutually abutting position, so that the contact between the two is a line contact; during operation, the elastic member bracket squeezes the unlocking sleeve, and the first elastic arm is pushed outward by the component force generated by the inclined surface or the arc surface, so that the second protrusion and the third protrusion are out of contact, thereby releasing the movement restriction of the elastic member bracket.

2. The injection device according to claim 1, characterized in that The second protrusion is provided with a first inclined surface at a position contacting the third protrusion, and the third protrusion is provided with a second inclined surface at a position contacting the second protrusion, and the inclination angles of the first inclined surface and the second inclined surface are different.

3. The injection device according to claim 2, characterized in that The second protrusion is provided with a first plane connected to the proximal end of the first slope; the third protrusion is provided with a second plane connected to the distal end of the second slope, and the first plane and the second plane are parallel to the first direction when in contact with each other.

4. The injection device according to claim 2, characterized in that The width of the first elastic arm at the narrowest part in the circumferential direction is set to 2mm-4mm, and the thickness of the first elastic arm in the radial direction is 0.7mm-1.1mm.

5. The injection device according to claim 1, characterized in that The side wall of the directional ring is provided with a first slot, and the first elastic arm is also provided with a fourth protrusion; after the injection is completed, after the elastic member bracket contracts inwardly, the fourth protrusion abuts against the first slot of the directional ring in the first direction to prevent the needle-piercing movement of the directional ring.

6. The injection device according to claim 5, characterized in that The surface of the fourth protrusion abutting against the first slot is inclined to form an inverted hook structure.

7. The injection device according to claim 6, characterized in that The inclination angle of the surface of the fourth protrusion abutting against the first slot is 10°-30°.

8. The injection device according to claim 5, characterized in that A first latch tongue extending into the first latch groove is disposed on the outer side of the elastic member bracket, and through the cooperation between the first latch groove and the first latch tongue, and the elastic force of the elastic member, a linkage in a first direction is established between the elastic member bracket and the directional ring.

9. The injection device according to any one of claims 1 to 8, characterized in that: The injection push rod is provided with a blind hole for accommodating the elastic member, and the opening of the blind hole is located at the distal end of the injection push rod; one end of the elastic member abuts against the bottom wall of the blind hole, and the other end passes through the opening of the blind hole and abuts against the distal end of the elastic member bracket, so that the injection push rod moves axially following the axial movement of the elastic member bracket.

10. The injection device according to claim 8, characterized in that The elastic member bracket comprises a top cover and a second elastic arm connected to two sides of the top cover and extending along a first direction, the first latch is arranged on the second elastic arm; the other end of the elastic member abuts against the top cover.

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